Etymology
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Words related to supersonic

super- 
word-forming element meaning "above, over, beyond," from Latin super (adverb and preposition) "above, over, on the top (of), beyond, besides, in addition to," from *(s)uper-, variant form of PIE root *uper "over." In English words from Old French, it appears as sur-. The primary sense seems to have shifted over time from usually meaning "beyond" to usually meaning "very much," which can be contradictory. E.g. supersexual, which is attested from 1895 as "transcending sexuality," from 1968 as "very sexual."
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sonic (adj.)

1923, from Latin sonus "sound" (from PIE root *swen- "to sound") + -ic. Sonic boom is attested from 1952.

ultrasonic (adj.)
"having frequency beyond the audible range," 1923, from ultra- "beyond" + sonic. For sense, see supersonic.
subsonic (adj.)
also sub-sonic, 1937, from sub- + sonic. Compare supersonic.